I know this ia a no no, but it was necessary to get scons run_tests, going on my debian box,
even with usepedanitc off.
My g++ version is 4.3.1, that may explain the different behavour.
#include'd cstdlib. This checkin is to see if this hurts the other ports.

Merge of branches/windows_from_1431_trunk.
Revamp of the exception system.
Fix unused vars and signed/unsigned comparisons.
defined a macro THROW(ARG) in the system_dep.h's to
deal with the expectations of declarations on different architectures.
Details in the logs of branches/windows_from_1431_trunk.
pre-merge snapshot of the trunk in tags/trunk_at_1452

The MPI branch is hereby closed. All future work should be in trunk.
Previously in revision 1295 I merged the latest changes to trunk into trunk-mpi-branch.
In this revision I copied all files from trunk-mpi-branch over the corresponding
trunk files. I did not use 'svn merge', it was a copy.

Changes needed for windows. This still does not work on and has not run on linux and the altix.
There are a few changes in names in the scons script, in particular _libs is used rather than _lib and _libs is always a list. By default on windows MSVC is used. The location of python is at C:\Program Files\python<version>, boost at C:\Program Files\boost and netcdf at C:\Program Files\netcdf.

Added explicit destructors to all Exception classes.
Fixed an ifdef in TestCase.cpp
Made the conditional definition of M_PI in LocalOps.h
depend only on M_PI being undefined.
Replace dynamically dimensioned arrays in DataFactory & DataTagged with malloc.
sort() method of list does not take a named argument
(despite the manual's claims to the contary).

A few changes in the build mechanism and the file structure so scons can build release tar files:
* paso/src/Solver has been moved to paso/src
* all test_.py are now run_.py files and are assumed to be passing python tests. they can run by
scons py_tests and are part of the release test set
* escript/py_src/test_ are moved to escript/test/python and are installed in to the build directory
(rather then the PYTHONPATH).
* all py files in test/python which don't start with run_ or test_ are now 'local_py_tests'. they are installed i
by not run automatically.
* CppUnitTest is now treated as a escript module (against previous decisions).
* scons realse builds nor tar/zip files with relvant source code (src and tests in seperate files)
the python tests don't pass yet due to path problems.

+ NEW BUILD SYSTEM
This commit contains the new build system with cross-platform support.
Most things work are before though you can have more control.
ENVIRONMENT settings have changed:
+ You no longer require LD_LIBRARY_PATH or PYTHONPATH to point to the
esysroot for building and testing performed via scons
+ ACcESS altix users: It is recommended you change your modules to load
the latest intel compiler and other libraries required by boost to match
the setup in svn (you can override). The correct modules are as follows
module load intel_cc.9.0.026
export
MODULEPATH=${MODULEPATH}:/data/raid2/toolspp4/modulefiles/gcc-3.3.6
module load boost/1.33.0/python-2.4.1
module load python/2.4.1
module load numarray/1.3.3

The sparse solver can be called by paso now.
the building has been change to reduce some code redundancy:
now all scons SCscripts are importing scons/esys_options.py which
imports platform specific settings.